Objective requirements refer to the specific security environment that the theory of collective security envisages. According to the collective security scheme, an attack in the system against any state will trigger the combined resistance of all other states. It is, in other words, a scheme of ‘all against one;’ a scheme for creating a preponderance of power against the aggressor. Nevertheless, the existing security environment may not be conducive to follow such a principle in the international system at least for two reasons: the thermonuclear revolution and the grouping of states along ideological lines.